BS ISO 6531:2017 pdf free.Machinery for forestry一 Portable chain-saws一 Vocabulary. BS ISO 6531 1 Scope This document defines terms relating to the mechanical aspects of portable chain-saws, saw-chain and guide bars. The chain-saw positions are shown in Annex A. 2 Normative references There are no normative references in this document.3 Terms and definitions For the purposes of this document, the...